M400 2-Wire for Hazardous Areas

M400 2-wire

Process M400 2-Wire Transmitter

- for Hazardous Area Applications across the Chemical Industries

Intelligent Sensor Management (ISM), global hazardous area approvals and the rugged design of the M400 2-wire transmitter series provide outstanding operating reliability and process safety. These features ensure the M400`s suitability for use across the chemical industries. Easiest handling and on-site or remote access over HART to advanced ISM predictive diagnostics tools leads to reduced operating costs and increased process uptime.

The M400 2-wire transmitter is a single-channel, multi-parameter unit for pH / ORP, oxygen and conductivity measurement. Thanks to the mixed-mode input, which allows the use of analog or ISM sensors, the M400 2-wire offers a unique and smooth transition from analog to digital technology.


Specifications - M400 2-wire
ISM Plug and Measure, ACT, TTM, DLI
Approvals NEPSI Ex, ATEX / IECEx Zone1, cFMus Class 1 Div 1
Digital Input/Output Input: 2, galvanically isolated Output: 2 × open collector
Current Output 2 × 4 to 20 mA (loop powered), galvanically isolated
Communication HART®, FOUNDATION fieldbus™, PROFIBUS® PA
Temperature range – 20 to 60 °C (– 4 to 140 °F)
Measurement parameter pH / ORP, pH / pNa, DO, Cond 2E / 4E, GPO
Housing material Die cast aluminum
Display Backlit LCD, 4 lines
Parameters pH/ORP, DO, O2 gas, conductivity
Hazardous Area Classification M400/2H: NEPSI Zone 2, FM CI1 Div2 (in progress); M400(G)/2XH: ATEX Zone 1, NEPSI Zone 1, FM CI1 Div1 (in progress)
Sensor Type Analog or ISM

Features and Benefits:

  • Outstanding reliability and process safety
  • Predictive maintenance
  • Easy handling of measuring loops
  • Versatility



pH Measurements in Chlor-Alkali Production
A combination of elevated temperatures, the presence of oxidants, and highly sensitive sensor output signal makes reliable pH measurement in the chlor...


Data Sheet M400-2 wire Transmitter
The M400 2-wire multi-parameter transmitter, equipped with Intelligent Sensor Management (ISM) technology, provides highest reliability and process sa...

Quick Setup Guide

Quick Setup Guide Transmitter M400/2XH Cond Ind
This quick set up guide provides a brief instruction about how the m400 2-wire should be installed, connected, commissioned, and maintained.

User Manuals

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M400 2-wire


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M400 2-wire
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